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Volume 19, Number 4—April 2013

Photo Quiz

Who Is This Man?

The father of viral oncology, he discovered the first tumor virus and influenced many later scientists, including several Nobel laureates.

Is he:

A) Richard Shope

B) Peyton Rous

C) Simon Flexner

D) Thomas Rivers

E) Ludwik Gross

Decide first. Then turn the page.

Decide first. See companion article.


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